Methane-rich dry gas recovery system

Abstract

The utility model relates to a methane-rich dry gas recovery system and belongs to the technical field of waste gas recovery. The methane-rich dry gas recovery system comprises a filtering mechanism, a cooling mechanism and a collecting mechanism, wherein the filtering mechanism is provided with at least two filtering pieces, the at least two filtering pieces are connected in sequence, and the filtering pieces filter passing natural gas; the cooling mechanism is provided with at least two cooling parts, and the cooling parts are connected with the corresponding filtering parts so as to cool the natural gas passing through the filtering parts to the target temperature; and part of filtering pieces in the filtering mechanism are connected with the collecting mechanism so as to collect filtered components in the natural gas. The cooling part is arranged between the two corresponding adjacent filtering parts, so that the processes of primary filtering, primary cooling, secondary filtering, secondary cooling and final filtering of the natural gas are sequentially realized, and the treated natural gas is used as raw material gas. The methane-rich dry gas recovery system provided by the utility model is used for recovering and retreating natural gas.

Description

TECHNICAL FIELD

[0001] The utility model relates to waste gas recovery technical field especially relates to a kind of rich methane dry gas recovery system. BACKGROUND

[0002] Natural gas refers to a kind of combustible gas existing in nature, is a fossil fuel, including the gas formed in various natural processes in atmosphere, hydrosphere and lithosphere (including oilfield gas, gas field gas, mud volcano gas, coal-bed gas and biogenic gas etc.).

[0003] At present, the annual natural gas consumption of large chemical enterprises is more than 100 million cubic meters, and the natural gas energy consumption is large;At the same time, large chemical enterprises supporting device will produce methane gas in use process, and the content of methane and hydrogen in methane gas is high, and methane gas is relatively clean.

[0004] But in the prior art, the methane gas produced by large chemical enterprises is mostly recycled as fuel, which is a waste of resources. UTILITY MODEL CONTENT

[0005] The utility model provides a kind of rich methane dry gas recovery system, can use methane gas generated after treatment as raw gas, reduce waste, save resources.

[0006] The rich methane dry gas recovery system provided by the application comprises a filtering mechanism, a cooling mechanism and a collecting mechanism;The filtering mechanism is provided with at least two filtering elements, and the at least two filtering elements are connected in sequence, and the filtering element filters the natural gas passing through;The cooling mechanism is provided with at least two cooling elements, and the cooling element is connected with the corresponding filtering element to cool the natural gas passing through the filtering element to the target temperature;Part of the filtering elements in the filtering mechanism are connected with the collecting mechanism to collect the filtered components in the natural gas.The cooling element is arranged between the corresponding adjacent two filtering elements, so that the processes of preliminary filtering, preliminary cooling, re-filtering, re-cooling and final filtering of the natural gas are realized in sequence, and then the treated natural gas is used as raw gas.

[0007] The rich methane dry gas recovery system provided by the application filters, cools, re-filters, re-cools and re-filters the natural gas produced by large chemical enterprises supporting device, which can use the gas treated from the natural gas as raw gas, provide energy utilization rate and reduce resource waste.

[0008] In a possible implementation manner of the present application, the filtering mechanism comprises a first filtering assembly, a second filtering assembly and a third filtering assembly, and the cooling mechanism comprises a first cooling assembly and a second cooling assembly; the natural gas to be treated first passes through the first filtering assembly, and the first filtering assembly, the first cooling assembly, the second filtering assembly, the second cooling assembly and the third filtering assembly are sequentially connected in order; the filtering elements in the first filtering assembly and the second filtering assembly and the filtering element in the third filtering assembly are connected with the collecting mechanism.

[0009] In a possible implementation manner of the present application, the first filtering assembly comprises a filter, a first gas-liquid separator and a washing tower; the natural gas to be treated first passes through the filter, the filter is connected with the first gas-liquid separator, the first gas-liquid separator is connected with the washing tower, and the washing tower is connected with the first cooling assembly; the filter and the first gas-liquid separator are connected with the collecting mechanism.

[0010] In a possible implementation manner of the present application, the first cooling assembly comprises a first cooler, one end of the first cooler is connected with the washing tower, and the other end of the first cooler is connected with the second filtering assembly.

[0011] In a possible implementation manner of the present application, the second filtering assembly comprises a second gas-liquid separator, a desulfurizer and a compressor; the second gas-liquid separator is connected with the first cooler, the second gas-liquid separator, the desulfurizer and the compressor are sequentially connected in order, the compressor is connected with the second cooling assembly; and the second gas-liquid separator is connected with the collecting mechanism.

[0012] In a possible implementation manner of the present application, the second cooling assembly comprises a second cooler, one end of the second cooler is connected with the compressor, and the other end of the second cooler is connected with the third filtering assembly.

[0013] In a possible implementation manner of the present application, the third filtering assembly comprises a third gas-liquid separator, the third gas-liquid separator is connected with the second cooler, the third gas-liquid separator is connected with the collecting mechanism, and the third gas-liquid separator is connected with a raw gas separator; the natural gas passing through the first gas-liquid separator is treated and enters the raw gas separator, and is sent into a natural gas steam conversion system together with raw gas; and the raw gas separator is connected with the collecting mechanism.

[0014] In a possible implementation manner of the present application, the collecting mechanism comprises a collecting element, and the filter, the first gas-liquid separator, the second gas-liquid separator, the third gas-liquid separator and the raw gas separator are connected with the collecting element, so as to collect the liquid generated in the filtering process of the natural gas to be treated.

[0015] The one or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:

[0016] (1) the present application will be large chemical enterprise output rich methane dry gas is processed, and the rich methane dry gas after processing is used as raw material gas for preparing methanol; compared with using the rich methane dry gas as fuel, the resource utilization can be improved to a certain extent, the resource utilization is improved, and waste is reduced; and the original methanol preparation device is simply modified, the investment cost is low, and the implementation difficulty is small.

[0017] (2) since the output rich methane dry gas contains a certain amount of hydrogen, it can be used as the required hydrogen source in the natural gas steam conversion system; in the prior art, purge gas or pure hydrogen is mostly used as the required hydrogen source in the natural gas conversion system, and the rich methane dry gas in the present application can replace the purge gas or pure hydrogen as the required hydrogen source in the natural gas conversion system; the replaced purge gas or pure hydrogen can be used downstream or sold, further improving the resource utilization rate.

[0018] (3) by recycling the output rich methane dry gas as raw material, it can be applied to the device originally using the rich methane dry gas as fuel, and the replaced high-calorific-value raw material natural gas can be used as fuel for the conversion furnace; on the one hand, it can reduce the flue gas amount of the conversion furnace, reduce heat loss and energy consumption of the conversion system, prolong the service life of the conversion furnace tube, and improve the efficiency; on the other hand, the trace amount of carbon monoxide in the rich methane dry gas can be converted in the conversion furnace to be recycled, thereby reducing carbon emissions; and the use of combustion air can be reduced, and carbon dioxide emissions can be reduced; energy saving and emission reduction effect is achieved. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical scheme of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and those skilled in the art can obtain other drawings according to these drawings without creative labor.

[0020] Figure 1 It is a whole structure schematic diagram of the rich methane dry gas recovery system of the present application.

[0021] Figure 2 It is a connection structure schematic diagram of the first filter assembly and the first cooling assembly.

[0022] Figure 3 It is a connection structure schematic diagram of the second filter assembly and the second cooling assembly.

[0023] Icon: 1-filter mechanism; 11-first filter assembly; 111-filter; 112-first gas-liquid separator; 113-washing tower; 114-bottom pump; 12-second filter assembly; 121-second gas-liquid separator; 122-first desulfurizer; 123-second desulfurizer; 124-compressor; 13-third filter assembly; 131-third gas-liquid separator; 2-cooling mechanism; 21-first cooling assembly; 211-first cooler; 22-second cooling assembly; 221-second cooler; 3-collection mechanism; 31-collection; 4-raw gas separator. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0025] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it can be directly on the other component or there can be a middle component. When a component is referred to as being "connected to" another component, it can be directly connected to the other component or there can be a middle component. The terms "vertical", "horizontal", "upper", "lower", "left", "right", and similar expressions used in the description of the present application are for the purpose of illustration only and do not indicate the only embodiment.

[0026] In addition, the terms "first", "second", and the like are used only to describe and distinguish one component from another, and do not indicate or imply a relative importance or an order of magnitude. Therefore, a feature defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.

[0027] In the present application, unless otherwise explicitly specified and limited, the "on", "under", "above" and "over" of the first feature to the second feature can be that the first feature is in direct contact with the second feature, or the first feature is indirectly in contact with the second feature through an intermediate medium. Moreover, the "on", "above" and "over" of the first feature to the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The "under", "below" and "under" of the first feature to the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0028] Unless otherwise defined, all technical and scientific terms used in the present disclosure have the same meaning as commonly understood by one of ordinary skill in the art to which this present disclosure belongs. The terminology used in the present disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the present disclosure. The use of the terms "and / or" in the present disclosure encompasses any and all combinations of one or more of the associated listed items.

[0029] The present disclosure takes a 900,000 tons / year natural gas methanol device taking the methane-rich dry gas as an example. The content of each component in the raw material natural gas in the natural gas methanol device is about: 95.37% of methane, 1.88% of carbon dioxide, 1.81% of nitrogen.

[0030] Among them, taking the natural gas to be treated as an example, the methane content in the methane-rich dry gas is between 76%-78%, the hydrogen content is about 13%, the nitrogen content is about 8%, the carbon monoxide content is about 1.5%, and there are also trace amounts of sulfur and ammonia elements.

[0031] The present disclosure provides a methane-rich dry gas recovery system, referring to Figure 1 , Figure 1 The overall structure of the methane-rich dry gas recovery system is shown. The methane-rich dry gas recovery system comprises: a filtering mechanism 1, a cooling mechanism 2 and a collecting mechanism 3; wherein the filtering mechanism 1 is provided with at least two filtering pieces, the at least two filtering pieces are connected in sequence, and the filtering piece filters the natural gas passing through; the cooling mechanism 2 is provided with at least two cooling pieces, the cooling piece is connected with the corresponding filtering piece, so as to cool the natural gas passing through the filtering piece to the target temperature; part of the filtering piece in the filtering mechanism 1 is connected with the collecting mechanism 3, so as to collect the filtered components in the natural gas. The cooling piece is arranged between the corresponding adjacent two filtering pieces, so as to realize the processes of preliminary filtering, preliminary cooling, re-filtering, re-cooling, and final filtering of the natural gas in sequence, and then use the treated natural gas as raw gas.

[0032] In summary, referring to Figure 2 and Figure 3 , Figure 2 The connection structure of the first filtering assembly 11 and the first cooling assembly 21 is shown, Figure 3 The connection structure of the second filtering assembly 12 and the second cooling assembly 22 is shown. As Figure 1 , Figure 2 and Figure 3As shown, the filtering mechanism 1 can be arranged in the form of a structure comprising a first filtering assembly 11, a second filtering assembly 12 and a third filtering assembly 13, and the cooling mechanism 2 can be arranged in the form of a structure comprising a first cooling assembly 21 and a second cooling assembly 22.

[0033] The external device can be connected to the pipeline and the first filtering assembly 11, and the natural gas generated by the external device can first enter the first filtering assembly 11 through the pipeline. The first filtering assembly 11, the first cooling assembly 21, the second filtering assembly 12, the second cooling assembly 22 and the third filtering assembly 13 are sequentially connected, and the natural gas to be treated can sequentially pass through the first filtering assembly 11, the first cooling assembly 21, the second filtering assembly 12, the second cooling assembly 22 and the third filtering assembly 13, so as to remove the unnecessary impurities in the natural gas to be treated. In addition, part of the filtering elements in the first filtering assembly 11 and the second filtering assembly 12 and the filtering elements in the third filtering assembly 13 can be connected to the collecting mechanism 3, and the liquid generated during the impurity removal process of the natural gas to be treated can enter the collecting mechanism 3, so as to concentrate the liquid for treatment.

[0034] The specific process flow of the natural gas to be treated sequentially passing through the first filtering assembly 11, the first cooling assembly 21, the second filtering assembly 12, the second cooling assembly 22 and the third filtering assembly 13 is as follows:

[0035] 1) Preliminary filtering section

[0036] In the preliminary filtering section, that is, the stage of the natural gas to be treated entering the first filtering assembly 11 for filtering. The first filtering assembly 11 can be arranged in the form of a structure comprising a filter 111, a first gas-liquid separator 112 and a washing tower 113. The filter 111, the first gas-liquid separator 112 and the washing tower 113 are sequentially connected; the external device can be connected to the filter 111, for example, through a pipeline, so as to convey the natural gas to be treated generated by the external device into the filter 111; the washing tower 113 can be connected to the first cooling assembly 21, so as to convey the natural gas to be treated passing through the first filtering assembly 11 to the first cooling assembly 21. In addition, the filter 111 and the first gas-liquid separator 112 can be connected to the collecting mechanism 3, so that the liquid generated by the filter 111 and the first gas-liquid separator 112 during the working process can be collected in the collecting mechanism 3.

[0037] In this way, the filter 111 is connected with two equal-diameter pipelines, both of which can pass the methane-rich dry gas. One of the pipelines passes the methane-rich dry gas, which is then processed by subsequent processes, and the processed methane-rich dry gas is used as raw material gas. Since the methane-rich dry gas contains a large amount of methane, the methane-rich dry gas can be processed and used as raw material gas to produce methanol. The other pipeline passes the methane-rich dry gas, which can be used as fuel.

[0038] It should be explained that another pipeline can be connected to the pipeline connecting the methane-rich dry gas and the filter 111, and the end of the pipeline away from the filter 111 is connected to a corresponding device that can produce methane-rich dry gas. Valves are arranged on both pipelines, and by controlling the opening and closing of different valves, the process can be switched freely according to actual needs and system operation.

[0039] First, since the natural gas to be processed may contain slag, water or similar heavy hydrocarbon components, which can affect the operation of the methanol production system catalyst, the filter 111 can remove impurities in the natural gas to be processed. The filter 111 can be connected to the collection mechanism 3 through a pipeline, and the liquid generated in the process can enter the collection mechanism 3.

[0040] Second, the natural gas treated by the filter 111 enters the first gas-liquid separator 112 through a pipeline, and the natural gas treated by the filter 111 is further filtered to remove part of the water in the natural gas. The filtered water enters the collection mechanism 3 through a corresponding pipeline.

[0041] Finally, the natural gas treated by the first gas-liquid separator 112 enters the washing tower 113 through a pipeline, and the washing tower 113 removes impurities in the natural gas treated by the first gas-liquid separator 112. For example, the washing tower 113 processes trace amounts of nitrogen in the natural gas.

[0042] 2) Preliminary cooling section

[0043] In the embodiment of the present application, the first cooling assembly 21 can be configured in the form of a structure including a first cooler 211. One end of the first cooler 211 can be connected to the washing tower 113, that is, the natural gas passing through the washing tower 113 can enter the first cooler 211; the other end of the first cooler 211 can be connected to the second filtering assembly 12, that is, the natural gas passing through the first cooler 211 can enter the second filtering assembly 12.

[0044] The tower bottom pump 114 can be installed at a position corresponding to the washing tower 113, and is used to keep the liquid at the bottom of the washing tower 113 circulating to maintain the required temperature and pressure conditions. The tower bottom pump 114 can be connected to the washing tower 113 to improve the operation efficiency.

[0045] For example, when the natural gas to be treated enters the first cooler 211 from the washing tower 113, the first cooler 211 is used to cool the natural gas to a temperature of about 40° to facilitate subsequent processing.

[0046] 3) Secondary filtration section

[0047] In the embodiment of the present application, the second filtration assembly 12 can be configured to include a second gas-liquid separator 121, a desulfurizer, and a compressor 124. The second gas-liquid separator 121 can be connected to the first cooler 211, the second gas-liquid separator 121, the desulfurizer, and the compressor 124 are sequentially connected, and the compressor 124 can be connected to the second cooling assembly 22. The natural gas cooled by the first cooler 211 can pass through the second gas-liquid separator 121, the desulfurizer, and the compressor 124 in sequence; the second gas-liquid separator 121 can be connected to the collection mechanism 3, and the liquid filtered by the second gas-liquid separator 121 can flow into the collection mechanism 3.

[0048] The desulfurizer is provided with a desulfurization tank. After the natural gas passing through the second gas-liquid separator 121 passes through the desulfurization tank, the reagent in the desulfurization tank removes the trace amount of sulfur in the natural gas, and the total sulfur content in the natural gas after passing through the desulfurization tank is less than 0.005%. The desulfurization tank can work in a normal temperature environment, for example, the desulfurization tank can work at a temperature of 50° to 100°.

[0049] Taking the methane-rich dry gas to be treated as an example, the methane-rich dry gas may have a probability of being unable to match the subsequent process system due to low pressure, and therefore a compressor 124 needs to be added to achieve pressure matching. For example, the compressor 124 can increase the pressure to 3.59 MPa.

[0050] It should be explained that the number of desulfurizers in the present application can be set to two, and the two desulfurizers can be used in series or in parallel. In this way, when one of the desulfurizers needs to be replaced due to the expiration of the catalyst life or the failure of the catalyst, the other desulfurizer can be used normally; the probability of stopping normal work due to replacement of the desulfurizer is reduced, and the work efficiency is improved.

[0051] The second gas-liquid separator 121 can be connected to one of the desulfurizers, the desulfurizer can be connected to the other desulfurizer, and the other desulfurizer can be connected to the compressor 124.

[0052] For the convenience of understanding, two desulfurizers in the embodiments of the present application are divided into a first desulfurizer 122 and a second desulfurizer 123. The second gas-liquid separator 121 can be connected with the first desulfurizer 122, the first desulfurizer 122 can be connected with the second desulfurizer 123, and the second desulfurizer can be connected with the compressor 124; the above connections can all adopt a connecting mode of pipeline connection. A pipeline can also be additionally arranged between the second gas-liquid separator 121 and the compressor 124, one end of the pipeline can be connected between the second gas-liquid separator 121 and the first desulfurizer 122, the other end can be connected between the second gas-liquid separator 121 and the compressor 124, and a part of the pipeline can also be connected between the first desulfurizer 122 and the second desulfurizer 123.

[0053] Moreover, a valve is arranged on the pipeline connecting the second gas-liquid separator 121 and the first desulfurizer 122, a valve is arranged on the pipeline connecting the first desulfurizer 122 and the second desulfurizer 123, and a valve can also be arranged on the additionally arranged pipeline; the number and position of the valves are arranged according to actual use conditions.

[0054] 4) Secondary cooling section

[0055] In the embodiments of the present application, the second cooling assembly 22 can be arranged in the form of a structure including a second cooler 221; one end of the second cooler 221 can be connected with the compressor 124, and the other end can be connected with the third filtering assembly 13.

[0056] For example, when the natural gas to be treated enters the second cooler 221 through the compressor 124, the second cooler 221 is used to cool the natural gas to a temperature of about 40°, so as to facilitate subsequent processing.

[0057] 5) Secondary filtering section

[0058] In the embodiments of the present application, the third filtering assembly 13 can be arranged in the form of a structure including a third gas-liquid separator 131; the third gas-liquid separator 131 can be connected with the second cooler 221, and the third gas-liquid separator 131 can be connected with the raw gas separator 4; after the natural gas passing through the second cooler 221 enters the third gas-liquid separator 131 and is processed, the natural gas can enter the raw gas separator 4.

[0059] The third gas-liquid separator 131 and the raw gas separator 4 can all be connected with the collecting mechanism 3; the liquid generated in the process of the third gas-liquid separator 131 filtering the natural gas can enter the collecting mechanism 3, and the liquid generated in the process of the raw gas separator 4 separating the raw gas can also enter the collecting mechanism 3.

[0060] 6) Conversion section

[0061] The natural gas after the third gas-liquid separator 131 can enter the conversion system together with the raw gas after the raw gas separator 4, so as to produce methanol.

[0062] In summary, the combustible gas alarm can be arranged at the position where the two adjacent devices are connected and the area where the position is located. For example, the combustible gas online alarm can monitor the leakage of natural gas at the sealing points of the pipelines, valves and the like in the methane-rich dry gas recovery system, thereby reducing the probability of accidents.

[0063] In addition, the ammonia detector can be arranged on the pipeline connecting the washing tower 113 and the second gas-liquid separator 121, so as to detect the ammonia content of the natural gas after the washing tower 113. The sulfur detector can be arranged between the desulfurizer and the compressor 124, so as to detect the sulfur content of the natural gas after the desulfurizer. Alternatively, the ammonia detector and / or the sulfur detector can be arranged between the two adjacent devices, so as to monitor the ammonia content and the sulfur content of the natural gas at any time.

[0064] In the embodiment of the present application, the collecting mechanism 3 can be arranged in the form of a structure including a collecting member 31. The filter 111, the first gas-liquid separator 112, the second gas-liquid separator 121, the third gas-liquid separator 131 and the raw gas separator 4 can all be connected to the collecting member 31, so as to collect the liquid generated in the process of treating the natural gas.

[0065] For example, when the collecting member 31 is a sewage tank, the filter 111, the first gas-liquid separator 112, the second gas-liquid separator 121, the third gas-liquid separator 131 and the raw gas separator 4 can all be connected to the sewage tank through respective pipelines, so as to discharge the liquid generated in the process of treating the natural gas into the sewage tank. The sewage tank is connected to an external sewage system, so as to discharge the liquid in the sewage tank to a designated position through the external sewage system for centralized treatment.

[0066] In addition, the sewage tank can also be connected to a flare device or system, so as to remove the volatile gas in the sewage tank, reduce the pressure in the sewage tank, and reduce the probability of leakage or expansion of the volatile gas due to accumulation of the volatile gas.

[0067] The use process of the methane-rich dry gas recovery system provided in the present application is described below. In use:

[0068] First, the output methane-rich dry gas is introduced into the filter 111 to remove the residue, water or similar heavy hydrocarbon components in the methane-rich dry gas. After removing the impurities, the methane-rich dry gas enters the first gas-liquid separator 112, which performs a preliminary gas-liquid separation on the methane-rich dry gas, and the separated liquid enters the collection mechanism 3. The gas after the separation enters the washing tower 113. The washing tower 113 removes the trace nitrogen in the methane-rich dry gas after the first gas-liquid separator 112, and the removed methane-rich dry gas enters the first cooler 211. The first cooler 211 cools the methane-rich dry gas to 40°, and then the cooled methane-rich dry gas enters the second gas-liquid separator 121, which performs a gas-liquid separation on the methane-rich dry gas again, and the separated liquid enters the collection mechanism 3. The separated methane-rich dry gas enters the first desulfurizer 122 and / or the second desulfurizer 123, which removes the trace sulfur in the methane-rich dry gas. After removing the sulfur, the methane-rich dry gas is pressurized to 3.59 MPa by the compressor 124 and then enters the second cooler 221 to be cooled to 40°. The cooled methane-rich dry gas enters the third gas-liquid separator 131. After the treatment of the third gas-liquid separator 131, the treated liquid enters the collection mechanism 3, and the separated gas is combined with the raw material gas after the treatment of the raw material gas separator 4 and then sent to the natural gas steam reforming system to produce methanol.

[0069] It should be noted that the relational terms herein such as first and second and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any such actual relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element preceded by "comprises... a" does not, without more constraints, foreclose the existence of additional identical elements in the process, method, article, or apparatus that comprises the recited element.

[0070] Although the embodiments of the present application have been shown and described, it is to be understood that various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A methane-rich dry gas recovery system characterized by, The utility model relates to a natural gas processing device, including: A filtering mechanism (1) is provided with at least two filtering pieces, and the filtering pieces are sequentially connected, and the filtering pieces filter natural gas passing through; A cooling mechanism (2) is provided with at least two cooling pieces, and the cooling pieces are connected with corresponding filtering pieces to cool the natural gas passing through the filtering pieces to a target temperature; A collection mechanism (3) is connected with part of the filtering pieces in the filtering mechanism (1) to collect the filtered components in the natural gas; Wherein, the cooling piece is arranged between corresponding adjacent two filtering pieces, thereby sequentially realizing the processes of preliminary filtering, preliminary cooling, re-filtering, re-cooling and final filtering of natural gas, and then using the processed natural gas as raw gas.

2. The methane-rich dry gas recovery system of claim 1, wherein, The filtering mechanism (1) includes a first filtering assembly (11), a second filtering assembly (12) and a third filtering assembly (13), and the cooling mechanism (2) includes a first cooling assembly (21) and a second cooling assembly (22); wherein the natural gas to be processed first passes through the first filtering assembly (11), the first filtering assembly (11), the first cooling assembly (21), the second filtering assembly (12), the second cooling assembly (22) and the third filtering assembly (13) are sequentially connected in sequence; part of the filtering pieces in the first filtering assembly (11) and the second filtering assembly (12) and the filtering pieces in the third filtering assembly (13) are connected with the collection mechanism (3).

3. The methane-rich dry gas recovery system of claim 2, wherein, The first filtering assembly (11) includes a filter (111), a first gas-liquid separator (112) and a washing tower (113); the natural gas to be processed first passes through the filter (111), the filter (111) is connected with the first gas-liquid separator (112), the first gas-liquid separator (112) is connected with the washing tower (113), and the washing tower (113) is connected with the first cooling assembly (21); the filter (111) and the first gas-liquid separator (112) are connected with the collection mechanism (3).

4. The methane-rich dry gas recovery system of claim 3, wherein, The first cooling assembly (21) includes a first cooler (211), one end of the first cooler (211) is connected with the washing tower (113), and the other end is connected with the second filtering assembly (12).

5. The methane-rich dry gas recovery system of claim 4, wherein, The second filtering assembly (12) includes a second gas-liquid separator (121), a desulfurizer and a compressor (124); the second gas-liquid separator (121) is connected with the first cooler (211), the second gas-liquid separator (121), the desulfurizer and the compressor (124) are sequentially connected in sequence, the compressor (124) is connected with the second cooling assembly (22); and the second gas-liquid separator (121) is connected with the collection mechanism (3).

6. The methane-rich dry gas recovery system of claim 5, wherein, The second cooling assembly (22) comprises a second cooler (221), one end of which is connected with the compressor (124), and the other end of which is connected with the third filtering assembly (13).

7. The methane-rich dry gas recovery system of claim 6, wherein, The third filtering assembly (13) comprises a third gas-liquid separator (131), which is connected with the second cooler (221), and is connected with the collecting mechanism (3), and is connected with a raw material gas separator (4); the natural gas treated by the first gas-liquid separator (112) is sent into the raw material gas separator (4) together with the raw material gas, and is sent into a natural gas steam conversion system, and the raw material gas separator (4) is connected with the collecting mechanism (3).

8. The methane-rich dry gas recovery system of claim 7, wherein, The collecting mechanism (3) comprises a collecting piece (31), and the filter (111), the first gas-liquid separator (112), the second gas-liquid separator (121), the third gas-liquid separator (131) and the raw material gas separator (4) are all connected with the collecting piece (31), so as to collect the liquid generated in the filtering process of the natural gas to be treated.

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